Coma is unconsciousness caused by a disease, injury or poison. A person in a coma is described as comatose.


Causes of coma include disease, injury and poisoning.


Treatment depends on the cause of coma. Some of the causes are treatable and reversible and others may result in a permanent comatose state.


Coma is a serious condition. Tests including X-rays, blood tests, spinal tap (lumbar puncture), and electroencephalography (EEG) may be performed to determine the cause. Many patients recover, however, others may remain comatose or get worse.

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National Library of Medicine
The National Library of Medicine presents information and pictures about coma.